/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.hudi.common.table.log;

import org.apache.hudi.common.model.HoodieRecord;
import org.apache.hudi.common.util.Option;
import org.apache.hudi.common.util.collection.CachingIterator;

import java.util.Iterator;
import java.util.Map;

public class LogFileIterator<T> extends CachingIterator<HoodieRecord<T>> {
  HoodieMergedLogRecordScanner scanner;
  Map<String, HoodieRecord> records;
  Iterator<HoodieRecord> iterator;

  protected Option<HoodieRecord> removeLogRecord(String key) {
    return Option.ofNullable(records.remove(key));
  }

  public LogFileIterator(HoodieMergedLogRecordScanner scanner) {
    this.scanner = scanner;
    this.records = scanner.getRecords();
  }

  private boolean hasNextInternal() {
    if (iterator == null) {
      iterator = records.values().iterator();
    }
    if (iterator.hasNext()) {
      nextRecord = iterator.next();
      return true;
    }
    return false;
  }

  @Override
  protected boolean doHasNext() {
    return hasNextInternal();
  }

  @Override
  public void close() {
    scanner.close();
  }
}
